When things aren’t going well people have a tendency to put their head down. When others see them with their head down they lose confidence in these people (how do you have confidence in someone when they don’t believe in themselves?). This ends up keeping a down person down.
When a person has their head down they are thinking about the past and miss the present opportunities and have no chance of seeing future opportunities (figuratively as well as negatively).
Whether things are going well or going poorly, keep your head up, it will help you feel better about yourself as well as making it easier fir others to believe in yourself as well
Have a great day!